What would cause this?

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But basically what it looked like what the edge of the case hit the top of the chamber, obviously not allowing the slide to return to battery.

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That's going to be difficult to do unless you are chambering empty cases like in post #9 but as I said even that doesn't show the damage you have there.
The bullet itself is what hits the top of the chamber as a round enters, in a 1911. It is what's called a "controlled feed" as the round is stripped from the mag it rides up under the extractor on its way into the chamber vs a "push feed" where after being plucked from the mag the round is able to hop in any direction as its shoved towards the barrel.

That's a thought! I remember back in the early '80s, we had to do quite a bit of polishing on Colt Model 70 1911s. It became a fairly standard thing to do.

A few years back, I bought one of the Ruger LCPs and it wouldn't feed an entire magazine on a bet. A bit of time and Flitz has solved that problem.

I still don't think the crimp is enough. It may well be true that the crimp is in the area of the ogive and perhaps a little more OAL is worthwhile (FWIW, I load 230 RN and 200 SWC both to 1.250") but having daylight between the bullet and the casemouth just seems wrong.

I just got around to trying some things out. I made a dummy round with the same specs as the one that failed. I took the barrel down with me out of the kimber. I plunk tested it and there was a very small amount of resistance. It still went all the way in the chamber with out me assisting it, but it was not as smooth and free as I felt it should be.

So I made a few adjustments. I made the OAL to 1.26" and belled the cases just barely enough to let the bullet sit on there. I set the crimp just enough to remove the slight bell.

I plunk tested again and this time they dropped right in very smooth and free.

I also compared the new measurements to some American eagle 230 grain fmj round nose ammo I had. They are very close to matching those now. The American eagle is 1.27" OAL.

It's raining now but I am going to head out to the range in the morning and give them a try.

Well it was still raining a little bit today so I packed my bag and headed out anyway. When I got home naturally it cleared up though haha.

But the latest batch worked great. No issues at all. They feel a little on the hot side though so I need to play around with my powder charge. I know it's not scientific, but to me they feel hotter than my usual American eagle ammo, but less than some +p stuff I have.

Well it was still raining a little bit today so I packed my bag and headed out anyway. When I got home naturally it cleared up though haha.

But the latest batch worked great. No issues at all. They feel a little on the hot side though so I need to play around with my powder charge. I know it's not scientific, but to me they feel hotter than my usual American eagle ammo, but less than some +p stuff I have.

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If you reload, you need to get a reliable chronograph. If you don't have one, you are just playing blind mans bluff.

Interesting, makes me wonder what else you changed. The web on a 45 ACP case is too low for you to hit it at 1.240 with a 230g FMJ and that's the only logical reason a bullet seated .020 deeper could effect how they "plunk".

Doesn't matter if it works though, no reason to fix what isn't broken.

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